ISA: generic Linux thread info support

This patch takes the Linux thread info support scattered across
different ISA implementations (currently in ARM, ALPHA, and MIPS), and
unifies them into a single file.

Adds a few more helper functions to read out TGID, mm, etc.

ISA-specific information (e.g., ALPHA PCBB register) is now moved to
the corresponding isa_traits.hh files.

1 files changed, 186 insertions, 0 deletions

diff --git a/src/arch/generic/linux/threadinfo.hh b/src/arch/generic/linux/threadinfo.hh
new file mode 100644
index 000000000..6a5d031fa
--- /dev/null
+++ b/src/arch/generic/linux/threadinfo.hh
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Ali Saidi
+ *          Nathan Binkert
+ *          Dam Sunwoo
+ */
+
+#ifndef __ARCH_GENERIC_LINUX_THREADINFO_HH__
+#define __ARCH_GENERIC_LINUX_THREADINFO_HH__
+
+#include "cpu/thread_context.hh"
+#include "sim/system.hh"
+#include "sim/vptr.hh"
+
+namespace Linux {
+
+class ThreadInfo
+{
+  private:
+    ThreadContext *tc;
+    System *sys;
+    Addr pcbb;
+
+    template <typename T>
+    bool
+    get_data(const char *symbol, T &data)
+    {
+        Addr addr = 0;
+        if (!sys->kernelSymtab->findAddress(symbol, addr)) {
+            warn_once("Unable to find kernel symbol %s\n", symbol);
+            warn_once("Kernel not compiled with task_struct info; can't get "
+                      "currently executing task/process/thread name/ids!\n");
+            return false;
+        }
+
+        CopyOut(tc, &data, addr, sizeof(T));
+
+        data = TheISA::gtoh(data);
+
+        return true;
+    }
+
+  public:
+    ThreadInfo(ThreadContext *_tc, Addr _pcbb = 0)
+        : tc(_tc), sys(tc->getSystemPtr()), pcbb(_pcbb)
+    {
+
+    }
+    ~ThreadInfo()
+    {}
+
+    inline Addr
+    curThreadInfo()
+    {
+        if (!TheISA::CurThreadInfoImplemented)
+            panic("curThreadInfo() not implemented for this ISA");
+
+        Addr addr = pcbb;
+        Addr sp;
+
+        if (!addr)
+            addr = tc->readMiscRegNoEffect(TheISA::CurThreadInfoReg);
+
+        PortProxy &p = tc->getPhysProxy();
+        p.readBlob(addr, (uint8_t *)&sp, sizeof(Addr));
+
+        return sp & ~ULL(0x3fff);
+    }
+
+    inline Addr
+    curTaskInfo(Addr thread_info = 0)
+    {
+        int32_t offset;
+        if (!get_data("thread_info_task", offset))
+            return 0;
+
+        if (!thread_info)
+            thread_info = curThreadInfo();
+
+        Addr addr;
+        CopyOut(tc, &addr, thread_info + offset, sizeof(addr));
+
+        return addr;
+    }
+
+    int32_t
+    curTaskPID(Addr thread_info = 0)
+    {
+        int32_t offset;
+        if (!get_data("task_struct_pid", offset))
+            return -1;
+
+        int32_t pid;
+        CopyOut(tc, &pid, curTaskInfo(thread_info) + offset, sizeof(pid));
+
+        return pid;
+    }
+
+    int32_t
+    curTaskTGID(Addr thread_info = 0)
+    {
+        int32_t offset;
+        if (!get_data("task_struct_tgid", offset))
+            return -1;
+
+        int32_t tgid;
+        CopyOut(tc, &tgid, curTaskInfo(thread_info) + offset, sizeof(tgid));
+
+        return tgid;
+    }
+
+    int64_t
+    curTaskStart(Addr thread_info = 0)
+    {
+        int32_t offset;
+        if (!get_data("task_struct_start_time", offset))
+            return -1;
+
+        int64_t data;
+        // start_time is actually of type timespec, but if we just
+        // grab the first long, we'll get the seconds out of it
+        CopyOut(tc, &data, curTaskInfo(thread_info) + offset, sizeof(data));
+
+        return data;
+    }
+
+    std::string
+    curTaskName(Addr thread_info = 0)
+    {
+        int32_t offset;
+        int32_t size;
+
+        if (!get_data("task_struct_comm", offset))
+            return "FailureIn_curTaskName";
+
+        if (!get_data("task_struct_comm_size", size))
+            return "FailureIn_curTaskName";
+
+        char buffer[size + 1];
+        CopyStringOut(tc, buffer, curTaskInfo(thread_info) + offset, size);
+
+        return buffer;
+    }
+
+    int32_t
+    curTaskMm(Addr thread_info = 0)
+    {
+        int32_t offset;
+        if (!get_data("task_struct_mm", offset))
+            return -1;
+
+        int32_t mm_ptr;
+        CopyOut(tc, &mm_ptr, curTaskInfo(thread_info) + offset, sizeof(mm_ptr));
+
+        return mm_ptr;
+    }
+};
+
+} // namespace Linux
+
+#endif // __ARCH_GENERIC_LINUX_THREADINFO_HH__